Possible Clues:

• Home of some piranhas
• Rings about fabulous bird outside in river
• River banks in Cork and Linz eroded by ducks over a century
• One following course in Latin parts from men in old firm
• River of South America
• 'Mighty water, river current firm, going round in circles'
• Home to 15-foot-long crocodiles
• Ciudad Bolívar's river
• South American river whose name means 'a place to paddle'
• What follows Colombian course: bit of yakitori? No comment